I have Trim cooler with 4 shells in parallel configuration with TEMA type AES. It has reactor effluent on shell side and raw cooling water on tube side. I need to configure this heat exchanger in hysys EDR with 4 shells in parallel . No of passes on shell side is 1 and no of passes on tube side is 6 . How can I do it? Whether total no of tubes will be divided by 4 to match total area. Whether no of passes also need to changed in hysys EDR. Request your guidance. Also I am getting an error in hysys as : Pressure drop calculated is too high, 10 percent pressure drop is used. How can I remove this error.